Sheila Keen-Warren enters Palm Beach County court Oct. 4 facing charges of first-degree murder. Keen-Warren is accused of fatally shooting 40-year-old Marlene Warren at her home in Wellington on May 26, 1990. She supposedly dressed as a clown with balloons and flowers, and killed Marlene Warren at her front door. She later married Marlene’s husband, Michael Warren. (Lannis Waters / The Palm Beach Post)

“This is very serious and very unfair,” Michael Warren told ABC’s “20/20” about his wife Sheila Keen-Warren’s alleged role in the 1990 shooting death of his then-wife, Marlene Warren, by a person dressed as a clown. The case will be featured on Friday’s episode of “20/20,” which airs at 10 p.m.

The details of Warren’s death have haunted investigators in the nearly three decades since the crime: Someone dressed as a clown went to Warren’s Aero Club home with balloons and flowers, then shot and killed her when she opened the front door.

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The slaying at Warren’s Aero Club home shook the then-unincorporated Wellington. Keen-Warren, then Keen, worked for Michael Warren at the time of the shooting. Keen and Michael Warren were married in Las Vegas in 2002. Detectives in 1990 suspected Michael Warren may have been involved in Marlene Warren’s death. He has not been charged as part of the Palm Beach County Sheriff’s Office’s renewed investigation into the case.

ABC spoke with Warren’s mother and stepfather, and women who say they may have sold the clown costume to Keen-Warren. Palm Beach Post reporter Barbara Marshall — who has written several times about the case, including a retrospective published earlier this year before Keen-Warren’s arrest — also was interviewed for episode and discussed some of the details of the crime.